usr.bin/diff/diff.c

   1 /*      $OpenBSD: diff.c,v 1.65 2015/12/29 19:04:46 gsoares Exp $       */
   2
   3 /*
   4  * Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  *
  18  * Sponsored in part by the Defense Advanced Research Projects
  19  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  20  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
  21  */
  22
  23 #include <sys/cdefs.h>
  24 __FBSDID("$FreeBSD$");
  25
  26 #include <sys/stat.h>
  27
  28 #include <ctype.h>
  29 #include <err.h>
  30 #include <getopt.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <limits.h>
  36
  37 #include "diff.h"
  38 #include "xmalloc.h"
  39
  40 int      lflag, Nflag, Pflag, rflag, sflag, Tflag, cflag;
  41 int      diff_format, diff_context, status, ignore_file_case;
  42 int      tabsize = 8;
  43 char    *start, *ifdefname, *diffargs, *label[2], *ignore_pats;
  44 struct stat stb1, stb2;
  45 struct excludes *excludes_list;
  46 regex_t  ignore_re;
  47
  48 #define OPTIONS "0123456789aBbC:cdD:efhI:iL:lnNPpqrS:sTtU:uwX:x:"
  49 enum {
  50         OPT_TSIZE = CHAR_MAX + 1,
  51         OPT_STRIPCR,
  52         OPT_IGN_FN_CASE,
  53         OPT_NO_IGN_FN_CASE,
  54         OPT_NORMAL,
  55         OPT_HORIZON_LINES,
  56         OPT_SPEED_LARGE_FILES,
  57 };
  58
  59 static struct option longopts[] = {
  60         { "text",                       no_argument,            0,      'a' },
  61         { "ignore-space-change",        no_argument,            0,      'b' },
  62         { "context",                    optional_argument,      0,      'C' },
  63         { "ifdef",                      required_argument,      0,      'D' },
  64         { "minimal",                    no_argument,            0,      'd' },
  65         { "ed",                         no_argument,            0,      'e' },
  66         { "forward-ed",                 no_argument,            0,      'f' },
  67         { "ignore-matching-lines",      required_argument,      0,      'I' },
  68         { "ignore-case",                no_argument,            0,      'i' },
  69         { "paginate",                   no_argument,            NULL,   'l' },
  70         { "label",                      required_argument,      0,      'L' },
  71         { "new-file",                   no_argument,            0,      'N' },
  72         { "rcs",                        no_argument,            0,      'n' },
  73         { "unidirectional-new-file",    no_argument,            0,      'P' },
  74         { "show-c-function",            no_argument,            0,      'p' },
  75         { "brief",                      no_argument,            0,      'q' },
  76         { "recursive",                  no_argument,            0,      'r' },
  77         { "report-identical-files",     no_argument,            0,      's' },
  78         { "starting-file",              required_argument,      0,      'S' },
  79         { "expand-tabs",                no_argument,            0,      't' },
  80         { "initial-tab",                no_argument,            0,      'T' },
  81         { "unified",                    optional_argument,      0,      'U' },
  82         { "ignore-all-space",           no_argument,            0,      'w' },
  83         { "exclude",                    required_argument,      0,      'x' },
  84         { "exclude-from",               required_argument,      0,      'X' },
  85         { "ignore-file-name-case",      no_argument,            NULL,   OPT_IGN_FN_CASE },
  86         { "horizon-lines",              required_argument,      NULL,   OPT_HORIZON_LINES },
  87         { "no-ignore-file-name-case",   no_argument,            NULL,   OPT_NO_IGN_FN_CASE },
  88         { "normal",                     no_argument,            NULL,   OPT_NORMAL },
  89         { "speed-large-files",          no_argument,            NULL,   OPT_SPEED_LARGE_FILES},
  90         { "strip-trailing-cr",          no_argument,            NULL,   OPT_STRIPCR },
  91         { "tabsize",                    optional_argument,      NULL,   OPT_TSIZE },
  92         { NULL,                         0,                      0,      '\0'}
  93 };
  94
  95 void usage(void) __dead2;
  96 void push_excludes(char *);
  97 void push_ignore_pats(char *);
  98 void read_excludes_file(char *file);
  99 void set_argstr(char **, char **);
 100
 101 int
 102 main(int argc, char **argv)
 103 {
 104         const char *errstr = NULL;
 105         char *ep, **oargv;
 106         long  l;
 107         int   ch, dflags, lastch, gotstdin, prevoptind, newarg;
 108
 109         oargv = argv;
 110         gotstdin = 0;
 111         dflags = 0;
 112         lastch = '\0';
 113         prevoptind = 1;
 114         newarg = 1;
 115         diff_context = 3;
 116         diff_format = 0;
 117         while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) {
 118                 switch (ch) {
 119                 case '0': case '1': case '2': case '3': case '4':
 120                 case '5': case '6': case '7': case '8': case '9':
 121                         if (newarg)
 122                                 usage();        /* disallow -[0-9]+ */
 123                         else if (lastch == 'c' || lastch == 'u')
 124                                 diff_context = 0;
 125                         else if (!isdigit(lastch) || diff_context > INT_MAX / 10)
 126                                 usage();
 127                         diff_context = (diff_context * 10) + (ch - '0');
 128                         break;
 129                 case 'a':
 130                         dflags |= D_FORCEASCII;
 131                         break;
 132                 case 'b':
 133                         dflags |= D_FOLDBLANKS;
 134                         break;
 135                 case 'C':
 136                 case 'c':
 137                         cflag = 1;
 138                         diff_format = D_CONTEXT;
 139                         if (optarg != NULL) {
 140                                 l = strtol(optarg, &ep, 10);
 141                                 if (*ep != '\0' || l < 0 || l >= INT_MAX)
 142                                         usage();
 143                                 diff_context = (int)l;
 144                         }
 145                         break;
 146                 case 'd':
 147                         dflags |= D_MINIMAL;
 148                         break;
 149                 case 'D':
 150                         diff_format = D_IFDEF;
 151                         ifdefname = optarg;
 152                         break;
 153                 case 'e':
 154                         diff_format = D_EDIT;
 155                         break;
 156                 case 'f':
 157                         diff_format = D_REVERSE;
 158                         break;
 159                 case 'h':
 160                         /* silently ignore for backwards compatibility */
 161                         break;
 162                 case 'I':
 163                         push_ignore_pats(optarg);
 164                         break;
 165                 case 'i':
 166                         dflags |= D_IGNORECASE;
 167                         break;
 168                 case 'L':
 169                         if (label[0] == NULL)
 170                                 label[0] = optarg;
 171                         else if (label[1] == NULL)
 172                                 label[1] = optarg;
 173                         else
 174                                 usage();
 175                         break;
 176                 case 'l':
 177                         lflag = 1;
 178                         break;
 179                 case 'N':
 180                         Nflag = 1;
 181                         break;
 182                 case 'n':
 183                         diff_format = D_NREVERSE;
 184                         break;
 185                 case 'p':
 186                         if (diff_format == 0)
 187                                 diff_format = D_CONTEXT;
 188                         dflags |= D_PROTOTYPE;
 189                         break;
 190                 case 'P':
 191                         Pflag = 1;
 192                         break;
 193                 case 'r':
 194                         rflag = 1;
 195                         break;
 196                 case 'q':
 197                         diff_format = D_BRIEF;
 198                         break;
 199                 case 'S':
 200                         start = optarg;
 201                         break;
 202                 case 's':
 203                         sflag = 1;
 204                         break;
 205                 case 'T':
 206                         Tflag = 1;
 207                         break;
 208                 case 't':
 209                         dflags |= D_EXPANDTABS;
 210                         break;
 211                 case 'U':
 212                 case 'u':
 213                         diff_format = D_UNIFIED;
 214                         if (optarg != NULL) {
 215                                 l = strtol(optarg, &ep, 10);
 216                                 if (*ep != '\0' || l < 0 || l >= INT_MAX)
 217                                         usage();
 218                                 diff_context = (int)l;
 219                         }
 220                         break;
 221                 case 'w':
 222                         dflags |= D_IGNOREBLANKS;
 223                         break;
 224                 case 'X':
 225                         read_excludes_file(optarg);
 226                         break;
 227                 case 'x':
 228                         push_excludes(optarg);
 229                         break;
 230                 case OPT_HORIZON_LINES:
 231                         break; /* XXX TODO for compatibility with GNU diff3 */
 232                 case OPT_IGN_FN_CASE:
 233                         ignore_file_case = 1;
 234                         break;
 235                 case OPT_NO_IGN_FN_CASE:
 236                         ignore_file_case = 0;
 237                         break;
 238                 case OPT_NORMAL:
 239                         diff_format = D_NORMAL;
 240                         break;
 241                 case OPT_TSIZE:
 242                         tabsize = (int) strtonum(optarg, 1, INT_MAX, &errstr);
 243                         if (errstr) {
 244                                 warnx("Invalid argument for tabsize");
 245                                 usage();
 246                         }
 247                         break;
 248                 case OPT_SPEED_LARGE_FILES:
 249                         break; /* ignore but needed for compatibility with GNU diff */
 250                 case OPT_STRIPCR:
 251                         dflags |= D_STRIPCR;
 252                         break;
 253                 default:
 254                         usage();
 255                         break;
 256                 }
 257                 lastch = ch;
 258                 newarg = optind != prevoptind;
 259                 prevoptind = optind;
 260         }
 261         argc -= optind;
 262         argv += optind;
 263
 264 #ifdef __OpenBSD__
 265         if (pledge("stdio rpath tmppath", NULL) == -1)
 266                 err(2, "pledge");
 267 #endif
 268
 269         /*
 270          * Do sanity checks, fill in stb1 and stb2 and call the appropriate
 271          * driver routine.  Both drivers use the contents of stb1 and stb2.
 272          */
 273         if (argc != 2)
 274                 usage();
 275         if (ignore_pats != NULL) {
 276                 char buf[BUFSIZ];
 277                 int error;
 278
 279                 if ((error = regcomp(&ignore_re, ignore_pats,
 280                                      REG_NEWLINE | REG_EXTENDED)) != 0) {
 281                         regerror(error, &ignore_re, buf, sizeof(buf));
 282                         if (*ignore_pats != '\0')
 283                                 errx(2, "%s: %s", ignore_pats, buf);
 284                         else
 285                                 errx(2, "%s", buf);
 286                 }
 287         }
 288         if (strcmp(argv[0], "-") == 0) {
 289                 fstat(STDIN_FILENO, &stb1);
 290                 gotstdin = 1;
 291         } else if (stat(argv[0], &stb1) != 0)
 292                 err(2, "%s", argv[0]);
 293         if (strcmp(argv[1], "-") == 0) {
 294                 fstat(STDIN_FILENO, &stb2);
 295                 gotstdin = 1;
 296         } else if (stat(argv[1], &stb2) != 0)
 297                 err(2, "%s", argv[1]);
 298         if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
 299                 errx(2, "can't compare - to a directory");
 300         set_argstr(oargv, argv);
 301         if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
 302                 if (diff_format == D_IFDEF)
 303                         errx(2, "-D option not supported with directories");
 304                 diffdir(argv[0], argv[1], dflags);
 305         } else {
 306                 if (S_ISDIR(stb1.st_mode)) {
 307                         argv[0] = splice(argv[0], argv[1]);
 308                         if (stat(argv[0], &stb1) < 0)
 309                                 err(2, "%s", argv[0]);
 310                 }
 311                 if (S_ISDIR(stb2.st_mode)) {
 312                         argv[1] = splice(argv[1], argv[0]);
 313                         if (stat(argv[1], &stb2) < 0)
 314                                 err(2, "%s", argv[1]);
 315                 }
 316                 print_status(diffreg(argv[0], argv[1], dflags, 1), argv[0],
 317                     argv[1], "");
 318         }
 319         exit(status);
 320 }
 321
 322 void
 323 set_argstr(char **av, char **ave)
 324 {
 325         size_t argsize;
 326         char **ap;
 327
 328         argsize = 4 + *ave - *av + 1;
 329         diffargs = xmalloc(argsize);
 330         strlcpy(diffargs, "diff", argsize);
 331         for (ap = av + 1; ap < ave; ap++) {
 332                 if (strcmp(*ap, "--") != 0) {
 333                         strlcat(diffargs, " ", argsize);
 334                         strlcat(diffargs, *ap, argsize);
 335                 }
 336         }
 337 }
 338
 339 /*
 340  * Read in an excludes file and push each line.
 341  */
 342 void
 343 read_excludes_file(char *file)
 344 {
 345         FILE *fp;
 346         char *buf, *pattern;
 347         size_t len;
 348
 349         if (strcmp(file, "-") == 0)
 350                 fp = stdin;
 351         else if ((fp = fopen(file, "r")) == NULL)
 352                 err(2, "%s", file);
 353         while ((buf = fgetln(fp, &len)) != NULL) {
 354                 if (buf[len - 1] == '\n')
 355                         len--;
 356                 if ((pattern = strndup(buf, len)) == NULL)
 357                         err(2, "xstrndup");
 358                 push_excludes(pattern);
 359         }
 360         if (strcmp(file, "-") != 0)
 361                 fclose(fp);
 362 }
 363
 364 /*
 365  * Push a pattern onto the excludes list.
 366  */
 367 void
 368 push_excludes(char *pattern)
 369 {
 370         struct excludes *entry;
 371
 372         entry = xmalloc(sizeof(*entry));
 373         entry->pattern = pattern;
 374         entry->next = excludes_list;
 375         excludes_list = entry;
 376 }
 377
 378 void
 379 push_ignore_pats(char *pattern)
 380 {
 381         size_t len;
 382
 383         if (ignore_pats == NULL)
 384                 ignore_pats = xstrdup(pattern);
 385         else {
 386                 /* old + "|" + new + NUL */
 387                 len = strlen(ignore_pats) + strlen(pattern) + 2;
 388                 ignore_pats = xreallocarray(ignore_pats, 1, len);
 389                 strlcat(ignore_pats, "|", len);
 390                 strlcat(ignore_pats, pattern, len);
 391         }
 392 }
 393
 394 void
 395 print_only(const char *path, size_t dirlen, const char *entry)
 396 {
 397         if (dirlen > 1)
 398                 dirlen--;
 399         printf("Only in %.*s: %s\n", (int)dirlen, path, entry);
 400 }
 401
 402 void
 403 print_status(int val, char *path1, char *path2, const char *entry)
 404 {
 405         switch (val) {
 406         case D_BINARY:
 407                 printf("Binary files %s%s and %s%s differ\n",
 408                     path1, entry, path2, entry);
 409                 break;
 410         case D_DIFFER:
 411                 if (diff_format == D_BRIEF)
 412                         printf("Files %s%s and %s%s differ\n",
 413                             path1, entry, path2, entry);
 414                 break;
 415         case D_SAME:
 416                 if (sflag)
 417                         printf("Files %s%s and %s%s are identical\n",
 418                             path1, entry, path2, entry);
 419                 break;
 420         case D_MISMATCH1:
 421                 printf("File %s%s is a directory while file %s%s is a regular file\n",
 422                     path1, entry, path2, entry);
 423                 break;
 424         case D_MISMATCH2:
 425                 printf("File %s%s is a regular file while file %s%s is a directory\n",
 426                     path1, entry, path2, entry);
 427                 break;
 428         case D_SKIPPED1:
 429                 printf("File %s%s is not a regular file or directory and was skipped\n",
 430                     path1, entry);
 431                 break;
 432         case D_SKIPPED2:
 433                 printf("File %s%s is not a regular file or directory and was skipped\n",
 434                     path2, entry);
 435                 break;
 436         }
 437 }
 438
 439 void
 440 usage(void)
 441 {
 442         (void)fprintf(stderr,
 443             "usage: diff [-abdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n"
 444             "            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]\n"
 445             "            [-I pattern] [-L label] file1 file2\n"
 446             "       diff [-abdilpTtw] [-I pattern] [-L label] [--ignore-case]\n"
 447             "            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]\n"
 448             "            -C number file1 file2\n"
 449             "       diff [-abdiltw] [-I pattern] [--ignore-case] [--no-ignore-case]\n"
 450             "            [--normal] [--strip-trailing-cr] [--tabsize] -D string file1 file2\n"
 451             "       diff [-abdilpTtw] [-I pattern] [-L label] [--ignore-case]\n"
 452             "            [--no-ignore-case] [--normal] [--tabsize] [--strip-trailing-cr]\n"
 453             "            -U number file1 file2\n"
 454             "       diff [-abdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n"
 455             "            [--no-ignore-case] [--normal] [--tabsize] [-I pattern] [-L label]\n"
 456             "            [-S name] [-X file] [-x pattern] dir1 dir2\n");
 457
 458         exit(2);
 459 }